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barcodude
Joined: 14 Jun 2014 Posts: 169 Location: The Netherlands
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Link Posted: Sun Jan 10, 2016 1:20 pm Post subject: gamma question |
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when i use my box 1020 from x-vue for gamma correction can i over do it?
because when i callibrate it to a movie like the dark knight rises i can turn the knob full throtle but when i watch another movie with light scenes it's to light so i need to compensate by turning down contrast on my crt pj.
How do you reconise a good gamma? and also the problem of white crush and black crush?
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AnalogRocks Forum Moderator
Joined: 08 Mar 2006 Posts: 26690 Location: Toronto, Ontario, Canada
TV/Projector: Sony 1252Q, AMPRO 4000G
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Link Posted: Sun Jan 10, 2016 5:26 pm Post subject: |
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Yeah you shouldn't have it cranked up. If you can take it out of the circuit and set up the brightness and contrast, pause a dark scene, then add the 1040 and adjust the gamma so you are ***just*** coming out of black. You should see the shadow detail coming out but not washing the dark areas out.
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kal Forum Administrator
Joined: 06 Mar 2006 Posts: 17860 Location: Ottawa, Canada
TV/Projector: JVC DLA-NZ7
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Link Posted: Sun Jan 10, 2016 5:35 pm Post subject: Re: gamma question |
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barcodude wrote: | when i use my box 1020 from x-vue for gamma correction can i over do it? |
Yes.
Quote: | because when i callibrate it to a movie like the dark knight rises i can turn the knob full throtle but when i watch another movie with light scenes it's to light so i need to compensate by turning down contrast on my crt pj. |
You can't calibrate to a movie. Calibrating means adjusting the display to known sources (test patterns). You can't use a movie to set gamma because you have no idea what the director intended to be seen.
Once calibrated, you don't adjust it again, nor should you.
Quote: | How do you reconise a good gamma? and also the problem of white crush and black crush? |
You calibrate.
You need to read this: http://www.curtpalme.com/forum/viewtopic.php?t=35322
It'll explain how to set gamma correctly and how to ensure you do not have any white or black crush.
Kal
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garyfritz
Joined: 08 Apr 2006 Posts: 12026 Location: Fort Collins, CO
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Link Posted: Mon Jan 11, 2016 1:33 am Post subject: Re: gamma question |
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kal wrote: | You can't calibrate to a movie. Calibrating means adjusting the display to known sources (test patterns). You can't use a movie to set gamma because you have no idea what the director intended to be seen. |
Kal is correct of course. You really need the proper equipment to calibrate properly.
But there are certain scenes that can be used as a reference. For example in the scene with Wormtongue and Eowyn in LOTR:EE, The Two Towers:
People with calibrated displays know what this is supposed to look like, and you can use their experience as a guide. If your black levels are set too low, or if your gamma is too low, Wormtongue's coat is totally black. If you have good shadow detail, you should *just* be able to make out the fur on his coat.
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kal Forum Administrator
Joined: 06 Mar 2006 Posts: 17860 Location: Ottawa, Canada
TV/Projector: JVC DLA-NZ7
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Link Posted: Mon Jan 11, 2016 1:49 am Post subject: Re: gamma question |
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garyfritz wrote: | People with calibrated displays know what this is supposed to look like, and you can use their experience as a guide. If your black levels are set too low, or if your gamma is too low, Wormtongue's coat is totally black. If you have good shadow detail, you should *just* be able to make out the fur on his coat. |
Yup - if you don't have calibration equipment and want to do something like gamma right, hints like the above are a step in the right direction (because they come from people who *have* calibrated their displays correctly and they know what they should see).
The scene above is a classic one that always comes up in any gamma calibration discussions.
Kal
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barcodude
Joined: 14 Jun 2014 Posts: 169 Location: The Netherlands
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Link Posted: Mon Jan 11, 2016 10:09 am Post subject: |
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thank's i did some movie calibration on the fly with lord of the rings and it looks impresive nice black scenes and Wormtongue's coat is just visible
_________________ Epson EMP TW700 - Projecta HomeScreen Deluxe- Denon a/v receiver - Mission highrisers -klipsch subwoofer - Samsung Bluray player
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